The only one to watch is the first one. Skip all the others. They add nothing to anything. But the first one is cool. Just remember when watching it that when it came out, the TV show didn't exist, so the concept of a hero who kills his opponents and takes their life force was brand new. A villain doing this would have been par for the course. But a hero? This had never been seen before.

Also the scenery is beautiful, the songs by Queen add majesty, and Sean Connery is brilliant, as is Clarence John Brown III, who plays the Kurgan.

Yes the first film was and is unique. But the way it ended was meant to be the end.

The second film was the obligatory sequel and both regular and director cut version that omits planet zeist were awful

Movie 3 was basically the script and plot of the first with some revisions but it changed the date of Brenda Wyatt from the second film, thus negating the second film, but it did not link to the TV series.

Highlander Endgame what kills this already mediocre film is the bad editing. There is a theatrical, cable version and dvd version all with confusing differences. Also the premise of the villain having the most kills of all active immortals was weak. Duncan struck down several ancient immortals in the series so this villain should not have been an issue. We also got the fan service fight of Connor vs Duncan

Highlander the Source. This movie is so bad it makes all other Highlander​ film.s look like Shakespeare. It skipped theaters and aired on the Syfy channel. Duncan, Joe and method weren't originally going to be in it but got added in. All involved agree this feeble movie did not happen. If you see this movie you will be sorry.

I would rather watch plan nine from outer space, blade Trinity, ghost Rider 2, Star trek FIVE, all Friday the 13th movies, all the Freddy kreuger movies, Godzilla vs megalon, Ultraman powered, wing Commander, super Mario brothers, mortal Kombat annihilation, hawk the Slayer, the first dungeon and dragons movie, Mars attacks, battleship, clue, and even the lost in space movie then watch Highlander Five the Source